Many houses________in the earthquake of April 20,2013 in Ya’an.
— _____ do you _____ math? —I like it a lot.
The teacher often says, “ _____ late for class.”
There is a policeman _____ the bus. He is watching the traffic.
—How long can I _____ the book? —For four days.
— _____ —Go down this street to the end.